为什么 matplotlib 复选框在 pyQt5 中不起作用？

Question

我的代码有一个小问题，因为我有一个带复选框的 matplotlib 图（用于选择要绘制的内容）但是当我用 Pyqt5（一个按钮）打开它时它确实打开了但是复选框不起作用，我们不能碰他们。我的功能运行良好，但不适用于 Pyqt5，我希望我足够精确，如果不够精确，我深表歉意。如果对您有帮助，这是我的代码：

from PyQt5.QtWidgets import QPushButton, QMainWindow, QApplication
import sys
from matplotlib.widgets import CheckButtons
import matplotlib.pyplot as plt


def graph_check () :
    x = [1,2,3,4,5,6]
    y1 = [1,1,1,1,3,1]
    y2 = [0,2,1,2,2,1]
    y3 = [4,3,2,0,0,5]
    fig,ax = plt.subplots()
    p1, = ax.plot(x,y1,color = 'red', label = 'red')
    p2, = ax.plot(x,y2,color = 'green', label = 'green')
    p3, = ax.plot(x,y3,color = 'blue', label = 'blue')
    lines = [p1,p2,p3]
    plt.subplots_adjust(left = 0.25, bottom=0.1, right=0.95,top = 0.95)
    # checkbuttons widgets
    labels = ['red', 'green', 'blue']
    activated = [True, True,True]
    axCheckbutton = plt.axes([0.03,0.4,0.15,0.15])
    chxbox = CheckButtons(axCheckbutton, labels,activated)
    def set_visible (label) :
        index = labels.index(label)
        lines[index].set_visible(not lines[index].get_visible())
        plt.draw()
    chxbox.on_clicked(set_visible)
    plt.show()
    # that function does work well, in the end we have a graph with 3 lines and we can make   
    # them visible or not thanks to the checkbox.

class Window(QMainWindow):
    def __init__(self):
        super().__init__()
        self.setGeometry(100, 100, 600, 400)
        self.btn1 = QPushButton('Graph check', self)
        self.btn1.setGeometry(130, 215, 125, 55)
        self.btn1.clicked.connect(self.btn1_onClicked)
        self.show()

    def btn1_onClicked(self):
        graph_check()
        # it works, we can see the graph but it is impossible to use the checkbox...


App = QApplication(sys.argv)
window = Window()
sys.exit(App.exec())

Answer 1

问题是因为“chxbox”是一个局部变量，当函数执行完成时，它的引用将被删除。一个可能的解决方案是使它成为另一个具有更大范围的对象的属性：

# ...
plt.chxbox = CheckButtons(axCheckbutton, labels, activated)

def set_visible(label):
    index = labels.index(label)
    lines[index].set_visible(not lines[index].get_visible())
    plt.draw()

plt.chxbox.on_clicked(set_visible)
# ...

为什么 matplotlib 复选框在 pyQt5 中不起作用？

Why aren't the matplotlib checkboxes working in pyQt5?

python

checkbox

plot

matplotlib

pyqt5